考虑管道自重荷载的埋地钢管结构计算方法

Structural Calculation Method for Buried Steel Pipe Considering Pipe Weight

埋地钢管在重大引调水工程中应用越发广泛,作为整个工程的生命线,保证其结构安全至关重要。然而,目前埋地钢管的结构计算方法仍然较为粗略,常忽略管道自重荷载。针对此,采用理论分析方法,在Spangler模型理论基础上,构建出考虑管道自重荷载的新计算方法,并与传统计算方法和有限元法结果比较分析。结果表明:新计算方法仅需在原计算公式的分子项上增加管重项,较为简单方便;管道自重对变形增幅的影响基本上不超过20%,对管径大且埋深小的管道,应予以考虑,而对管径<1 m或埋深>4 m的管道,可以忽略;新计算方法与有限元法得出的变形结果规律性较好,一般情况下其计算精度较传统方法更高,并且同样适用于其他类型的埋地柔性管道。

It is crucial to ensure the structural safety of buried steel pipes(BSP)as they are increasingly utilized in major water diversion projects,as the lifeline of these projects.However,current BSP structural calculation methods lack the consideration of pipe’s self-weight.In view of this,we developed a calculation method considering the self-weight of pipes based on the Spangler model theory,and compared the results with those of traditional and finite element methods.Results demonstrate that the proposed calculation method merely integrates the pipe weight term into the existing calculation equations,rendering it straightforward and convenient.The inclusion of pipe weight moderately increases pipe deformation by up to 20%.For pipes with substantial diameters and shallow cover depths,the self-weight should be taken into consideration,whereas for pipes with diameter less than 1 m or depth exceeding 4 m,the self-weight of pipes can be neglected.The proposed calculation method aligns more closely with the finite element method regarding pipe deformation patterns,with generally higher calculation accuracy compared to traditional methods.Moreover,the proposed calculation method is applicable to other typical buried flexible pipes.